﻿//fgnass.github.com/spin.js#v1.3

/**
* Copyright (c) 2011-2013 Felix Gnass
* Licensed under the MIT license
*/
(function (root, factory) {

    /* CommonJS */
    if (typeof exports == 'object') module.exports = factory()

    /* AMD module */
    else if (typeof define == 'function' && define.amd) define(factory)

    /* Browser global */
    else root.Spinner = factory()
}
(this, function () {
    "use strict";

    var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */
    , animations = {} /* Animation rules keyed by their name */
    , useCssAnimations /* Whether to use CSS animations or setTimeout */

    /**
    * Utility function to create elements. If no tag name is given,
    * a DIV is created. Optionally properties can be passed.
    */
    function createEl(tag, prop) {
        var el = document.createElement(tag || 'div')
      , n

        for (n in prop) el[n] = prop[n]
        return el
    }

    /**
    * Appends children and returns the parent.
    */
    function ins(parent /* child1, child2, ...*/) {
        for (var i = 1, n = arguments.length; i < n; i++)
            parent.appendChild(arguments[i])

        return parent
    }

    /**
    * Insert a new stylesheet to hold the @keyframe or VML rules.
    */
    var sheet = (function () {
        var el = createEl('style', { type: 'text/css' })
        ins(document.getElementsByTagName('head')[0], el)
        return el.sheet || el.styleSheet
    } ())

    /**
    * Creates an opacity keyframe animation rule and returns its name.
    * Since most mobile Webkits have timing issues with animation-delay,
    * we create separate rules for each line/segment.
    */
    function addAnimation(alpha, trail, i, lines) {
        var name = ['opacity', trail, ~ ~(alpha * 100), i, lines].join('-')
      , start = 0.01 + i / lines * 100
      , z = Math.max(1 - (1 - alpha) / trail * (100 - start), alpha)
      , prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase()
      , pre = prefix && '-' + prefix + '-' || ''

        if (!animations[name]) {
            sheet.insertRule(
        '@' + pre + 'keyframes ' + name + '{' +
        '0%{opacity:' + z + '}' +
        start + '%{opacity:' + alpha + '}' +
        (start + 0.01) + '%{opacity:1}' +
        (start + trail) % 100 + '%{opacity:' + alpha + '}' +
        '100%{opacity:' + z + '}' +
        '}', sheet.cssRules.length)

            animations[name] = 1
        }

        return name
    }

    /**
    * Tries various vendor prefixes and returns the first supported property.
    */
    function vendor(el, prop) {
        var s = el.style
      , pp
      , i

        if (s[prop] !== undefined) return prop
        prop = prop.charAt(0).toUpperCase() + prop.slice(1)
        for (i = 0; i < prefixes.length; i++) {
            pp = prefixes[i] + prop
            if (s[pp] !== undefined) return pp
        }
    }

    /**
    * Sets multiple style properties at once.
    */
    function css(el, prop) {
        for (var n in prop)
            el.style[vendor(el, n) || n] = prop[n]

        return el
    }

    /**
    * Fills in default values.
    */
    function merge(obj) {
        for (var i = 1; i < arguments.length; i++) {
            var def = arguments[i]
            for (var n in def)
                if (obj[n] === undefined) obj[n] = def[n]
            }
            return obj
        }

        /**
        * Returns the absolute page-offset of the given element.
        */
        function pos(el) {
            var o = { x: el.offsetLeft, y: el.offsetTop }
            while ((el = el.offsetParent))
                o.x += el.offsetLeft, o.y += el.offsetTop

            return o
        }

        /**
        * Returns progress tracker display.
        */
        function createProgressTracker(radius, length, offsetTop, offsetLeft, color) {
            var dim = 2 * (radius + length)

            if (dim < 50) dim = 50

            return css(createEl('div', { innerHTML: '0%' }), {
                textAlign: 'center',
                width: dim + 'px',
                height: dim + 'px',
                lineHeight: dim + 'px',
                position: 'absolute',
                top: (offsetTop - dim / 2) + 'px',
                left: (offsetLeft - dim / 2) + 'px',
                color: color
            })
        }

        // Built-in defaults

        var defaults = {
            lines: 12,            // The number of lines to draw
            length: 7,            // The length of each line
            width: 5,             // The line thickness
            radius: 10,           // The radius of the inner circle
            rotate: 0,            // Rotation offset
            corners: 1,           // Roundness (0..1)
            color: '#000',        // #rgb or #rrggbb
            direction: 1,         // 1: clockwise, -1: counterclockwise
            speed: 1,             // Rounds per second
            trail: 100,           // Afterglow percentage
            opacity: 1 / 4,         // Opacity of the lines
            fps: 20,              // Frames per second when using setTimeout()
            zIndex: 2e9,          // Use a high z-index by default
            className: 'spinner', // CSS class to assign to the element
            top: 'auto',          // center vertically
            left: 'auto',         // center horizontally
            position: 'relative', // element position
            progress: false,      // show progress tracker
            progressTop: 0,       // offset top for progress tracker
            progressLeft: 0       // offset left for progress tracker
        }

        /** The constructor */
        function Spinner(o) {
            if (typeof this == 'undefined') return new Spinner(o)
            this.opts = merge(o || {}, Spinner.defaults, defaults)
        }

        // Global defaults that override the built-ins:
        Spinner.defaults = {}

        merge(Spinner.prototype, {

            /**
            * Adds the spinner to the given target element. If this instance is already
            * spinning, it is automatically removed from its previous target b calling
            * stop() internally.
            */
            spin: function (target) {
                this.stop()

                var self = this
        , o = self.opts
        , el = self.el = css(createEl(0, { className: o.className }), { position: o.position, width: 0, zIndex: o.zIndex })
        , mid = o.radius + o.length + o.width
        , ep // element position
        , tp // target position

                if (target) {
                    target.insertBefore(el, target.firstChild || null)
                    tp = pos(target)
                    ep = pos(el)
                    css(el, {
                        left: (o.left == 'auto' ? tp.x - ep.x + (target.offsetWidth >> 1) : parseInt(o.left, 10) + mid) + 'px',
                        top: (o.top == 'auto' ? tp.y - ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid) + 'px'
                    })
                }

                el.setAttribute('role', 'progressbar')
                self.lines(el, self.opts)

                if (o.progress) {
                    self.progressTracker = createProgressTracker(o.radius, o.length, o.progressTop, o.progressLeft, o.color)
                    ins(el, self.progressTracker)
                }

                if (!useCssAnimations) {
                    // No CSS animation support, use setTimeout() instead
                    var i = 0
          , start = (o.lines - 1) * (1 - o.direction) / 2
          , alpha
          , fps = o.fps
          , f = fps / o.speed
          , ostep = (1 - o.opacity) / (f * o.trail / 100)
          , astep = f / o.lines

        ; (function anim() {
            i++;
            for (var j = 0; j < o.lines; j++) {
                alpha = Math.max(1 - (i + (o.lines - j) * astep) % f * ostep, o.opacity)

                self.opacity(el, j * o.direction + start, alpha, o)
            }

            self.timeout = self.el && setTimeout(anim, ~ ~(1000 / fps))
        })()
                }
                return self
            },

            /**
            * Stops and removes the Spinner.
            */
            stop: function () {
                var el = this.el
                if (el) {
                    clearTimeout(this.timeout)
                    if (el.parentNode) el.parentNode.removeChild(el)
                    this.el = undefined
                }
                return this
            },

            /**
            * Update progress status.
            */
            setProgress: function (completed, total) {
                if (this.progressTracker) {
                    total = total || 100
                    this.progressTracker.innerHTML = Math.round((completed / total) * 100) + '%'
                }
            },

            /**
            * Internal method that draws the individual lines. Will be overwritten
            * in VML fallback mode below.
            */
            lines: function (el, o) {
                var i = 0
        , start = (o.lines - 1) * (1 - o.direction) / 2
        , seg

                function fill(color, shadow) {
                    return css(createEl(), {
                        position: 'absolute',
                        width: (o.length + o.width) + 'px',
                        height: o.width + 'px',
                        background: color,
                        boxShadow: shadow,
                        transformOrigin: 'left',
                        transform: 'rotate(' + ~ ~(360 / o.lines * i + o.rotate) + 'deg) translate(' + o.radius + 'px' + ',0)',
                        borderRadius: (o.corners * o.width >> 1) + 'px'
                    })
                }

                for (; i < o.lines; i++) {
                    seg = css(createEl(), {
                        position: 'absolute',
                        top: 1 + ~(o.width / 2) + 'px',
                        transform: o.hwaccel ? 'translate3d(0,0,0)' : '',
                        opacity: o.opacity,
                        animation: useCssAnimations && addAnimation(o.opacity, o.trail, start + i * o.direction, o.lines) + ' ' + 1 / o.speed + 's linear infinite'
                    })

                    if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), { top: 2 + 'px' }))

                    ins(el, ins(seg, fill(o.color, '0 0 1px rgba(0,0,0,.1)')))
                }
                return el
            },

            /**
            * Internal method that adjusts the opacity of a single line.
            * Will be overwritten in VML fallback mode below.
            */
            opacity: function (el, i, val) {
                if (i < el.childNodes.length) el.childNodes[i].style.opacity = val
            }

        })


        function initVML() {

            /* Utility function to create a VML tag */
            function vml(tag, attr) {
                return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr)
            }

            // No CSS transforms but VML support, add a CSS rule for VML elements:
            sheet.addRule('.spin-vml', 'behavior:url(#default#VML)')

            Spinner.prototype.lines = function (el, o) {
                var r = o.length + o.width
        , s = 2 * r

                function grp() {
                    return css(
          vml('group', {
              coordsize: s + ' ' + s,
              coordorigin: -r + ' ' + -r
          }),
          { width: s, height: s }
        )
                }

                var margin = -(o.width + o.length) * 2 + 'px'
        , g = css(grp(), { position: 'absolute', top: margin, left: margin })
        , i

                function seg(i, dx, filter) {
                    ins(g,
          ins(css(grp(), { rotation: 360 / o.lines * i + 'deg', left: ~ ~dx }),
            ins(css(vml('roundrect', { arcsize: o.corners }), {
                width: r,
                height: o.width,
                left: o.radius,
                top: -o.width >> 1,
                filter: filter
            }),
              vml('fill', { color: o.color, opacity: o.opacity }),
              vml('stroke', { opacity: 0 }) // transparent stroke to fix color bleeding upon opacity change
            )
          )
        )
                }

                if (o.shadow)
                    for (i = 1; i <= o.lines; i++)
                        seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)')

                for (i = 1; i <= o.lines; i++) seg(i)
                return ins(el, g)
            }

            Spinner.prototype.opacity = function (el, i, val, o) {
                var c = el.firstChild
                o = o.shadow && o.lines || 0
                if (c && i + o < c.childNodes.length) {
                    c = c.childNodes[i + o]; c = c && c.firstChild; c = c && c.firstChild
                    if (c) c.opacity = val
                }
            }
        }

        var probe = css(createEl('group'), { behavior: 'url(#default#VML)' })

        if (!vendor(probe, 'transform') && probe.adj) initVML()
        else useCssAnimations = vendor(probe, 'animation')

        return Spinner

    }))